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\begin{equation*}\frac{\Delta F(P_0)}{\Delta P}=\frac{F(P_\acute{n})-F(P_0)}{\Delta_\acute{n}P}=\frac{F(P_1)-F(P_0)}{\Delta _1P}=\frac{F(P_1)-F(P_0)}{P_1-P_0}.\,\!\end{equation*}
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